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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfd0a9387b1d0610465a6a106b4437b151093c7360f80a14d3ec6e12ce28333' 
  AND token = 'UVm9P+XPRWKSyoQz83F5rQ+dih6CZvIZ9l1vwZCSF4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}